We found 26 dictionaries that define the word tiredness:

General (17 matching dictionaries)

1. tiredness: Merriam-Webster
2. tiredness: Oxford Learner's Dictionaries
3. tiredness: Collins English Dictionary
4. tiredness: Vocabulary.com
5. Tiredness, tiredness: Wordnik
6. tiredness: Cambridge Advanced Learner's Dictionary
7. tiredness: Wiktionary
8. tiredness: Dictionary.com
9. Tiredness: Wikipedia, the Free Encyclopedia
10. Tiredness: Online Plain Text English Dictionary
11. tiredness: Webster's Revised Unabridged, 1913 Edition
12. tiredness: Rhymezone
13. Tiredness: AllWords.com Multi-Lingual Dictionary
14. tiredness: Webster's 1828 Dictionary
15. tiredness: FreeDictionary.org
16. tiredness: Mnemonic Dictionary
17. tiredness: TheFreeDictionary.com

Business (2 matching dictionaries)

18. tiredness: Legal dictionary
19. tiredness: Financial dictionary

Computing (1 matching dictionary)

20. tiredness: Encyclopedia

Medicine (4 matching dictionaries)

21. tiredness: Merriam-Webster Medical Dictionary
22. Tiredness: MedTerms.com Medical Dictionary
23. University of Maryland Glossary of Medical Terms (No longer online)
24. Tiredness: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)

25. tiredness: Idioms

Slang (1 matching dictionary)

26. tiredness: Urban Dictionary

(Note: See tired as well.)

Definitions from Wiktionary (tiredness) ▸ noun:  The state of being tired. Similar: weariness, fatigue, untiredness, exhaustedness, overtiredness, fatiguingness, sleepiness, tiring, boredness, tiresomeness, more... Opposite: energy, vigor, vitality Phrases: extreme tiredness, not prone to tiredness, mental tiredness, great tiredness, exhibiting boredom or tiredness, more... Adjectives: unusual, extreme, physical, excessive, chronic, general, great, own, constant, daytime, mental ▸ Words similar to tiredness ▸ Usage examples for tiredness ▸ Idioms related to tiredness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing tiredness ▸ Words that often appear near tiredness ▸ Rhymes of tiredness ▸ Invented words related to tiredness